Tree stand



FIG. 1 is a Perspective view of a tree stand showing my new design;

FIG. 2 is a Front elevational view thereof;

FIG. 3 is a Rear elevational view thereof;

FIG. 4 is a Left side view thereof;

FIG. 5 is a Right side view thereof;

FIG. 6 is a Bottom plan view thereof; and,

FIG. 7 is a Top plan view thereof.

The broken lines in the drawing depict portions of the tree stand that form no part of the claimed design. 

CLAIM The ornamental design for a tree stand, as shown and described. 